Improvement in machines for making scroll-saws



J. P. O. RIDER. Machine for Making Scroll-Saws.

No. 221,253. Paten'ted Nov. 4, I879.

' r an Z g UNITED STATES PATENT OFFICE.

JOHN F. C. RIDER, OF SOUTH NEW MARKET, NEl/V HAMPSHIRE, ASSIGNOR TOHELEN A. RIDER, OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR MAKING SCROLL-SAWS.

Specification forming part of Letters Patent No. 221,253, dated November4, 1879; application filed December 28, 1878.

To all whom it may concern:

Be it known that I, JOHN F. O. RIDER, of South New Market, in the countyof Rockingham and State of New Hampshire, have invented certain new anduseful Improvements in Machines for Making Webs; and I do hereby declarethat the following is a full, clear, and exact description of theinvention, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

This invention relates to that class of machines used in the manufactureof saws, being especially adapted to the production of those used forscroll or fret sawing, usually called webs by the trade. These saws aregenerally very narrow, to enable them to turn short curves in sawingornamental work. They are therefore very liable to be broken in use,requirin g the frequent replacement of a broken saw by a new one, thusmaking it an object to render their manufacture as cheap as possible.

This invention is therefore intended tolessen the cost of production ofthese saws, as well as furnish an article perfect in all respects forthe purpose to which it is to be applied, the method of manufacturebeing such as to insure regularity in the teeth as well as in the widthof the webs; and theinvention consists in the construction andcombination of devices for accomplishing this result, as will behereinafter fully described, and then specifically claimed.

In the drawings, Figure 1 is a side elevation of the machine, showingthe general construction and relative arrangement of the parts. Fig. 2is a transverse vertical section on the line w as of Fig. 1. Fig. 3 is alongitudinal section of part of the machine on the line 3 y of Fig. 2.Fig. 4 shows'a modification of the means used for giving motion to thevertically-reciprocatin g cross-head of th e machine.

The bed A of the machine is of rectangular form, and carried uponsuitable legs or other supports, A, so as to bring the working parts ofthe machine to a convenient height for the operator. Attached to eachside of this bed, by bolts or other suitable means, are the slotteduprights B B, carrying upon their tops the journal-boxes a. a, in whichrests and revolves oted to the frame at h.

the driving-shaft O. This shaft receives its motion from any suitableprime mover through a belt upon the pulley D. The shaft 0 is formed witha crank or cam, 0, between the journal-boxes a a, to which is attachedthe coin nectingrod E, the lower end of which is pivoted in the top ofthe cross-head F, which reciprocates vertically in the slots of theuprights B B. Depending from the lower part of the cross-head are twoside extensions, 12 11, carrying the journal-boxes in which rotates thetooth-cutter G. This cutter has its periphery formed with sharp threads,corresponding in depth, pitch, and shape to the teeth of the saw to bemade, and longitudinal grooves cutting said threads transversely,forming cuttingedges running from end to end. It alsohasa rotatin gmotion communicated to it by the belt H, running upon the pulley G. Thisbelt receives motion from the pulley I upon the countershaft 1, runningin bearings placed at the end of the extension A of the side pieces ofthe frame A. Upon the opposite end of this counter-shaft I from thepulley I is secured the pulley J, which receives a belt, J, from thepulley D upon the driving-shaft C.

It will thus be seen that the rotation of the driving-shaft not onlycommunicates a reciprocating movement to the cross-head, but, throughthe system of gearing, gives a quick rotating movement to the cutter Grat the same time that it is reciprocated vertically.

Upon the front of the cross-head F is secured the cutting-blade c,placed the width of a sawblade in advance of the cutter G, which, as thecross-head descends, comes in close proximity to a hardened-steel edge,d, of the bed K, severing a completed saw from the steel plate or stockL at each reciprocation of the cross-head.

In order to feed the stock properly to the cutters av pin, f, isattached to the cross-head, and, by means of the pitman g, is connectedwith one arm of a bell-crank, M, which is piw To the opposite end ofthis bell-crank is pivoted the pawl i, which engages with theratchetwheel N upon the feed roll 6. This roll is connected by means ofspur-gears with the feed-roll e, placed above it. By this arrangement,when the cross-head and cutters ascend after having formed a web or saw,the feed-rolls will be rotated in such a manner as to feed the stock Lforward a sulfieient distance to furnish material for another web, whichis formed and cut off by the de scent of the cross-head.

It is evident that other means may be used for feeding and holding thestock in position while being operated upon by the machine withoutdeparting from the spirit of the invention but the apparatus describedis preferred to any hitherto tried.

Additional supporting-rolls I may be placed wherever needed on the frameto support the stock properly.

In order to cut webs of different widths the cutter 0 may be advanced inits seat by placing one or more thicknesses of paper or pasteboardbehind it before the screws which hold it are set up, the cutters (7upon the bed K being placed sufiiciently far back to allow of theadjustment. Other means might be used to produce this result, such aschanging the position of the rotating cutter by shitting the position ofthe journal-boxes in which it revolves; but this would require a morecostly and complicated mode of construction.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent, the following:

1. In a machine for making saws, operating as described, the combinationof the devices for cutting all the teeth in the web simultaneously withthe devices for severing each web from the stock alternately with thecutting of the teeth, substantially as set forth.

2. In a machine for making saws, the combination of a rotating andvertically-reciprocatin g tooth-cutter, a reeiprocatin g Web-cutter, andfeeding mechanism, substantially as shown and described, for feeding thestock to the cutters, as set forth.

3. The vertically-reciprocating cross-head I, carrying the rotatingtoothcutter and webcutter c, in combination with the bed K, providedwith the stationary cutter d, all constructed and arranged forjointoperation in the manner shown and described.

In testimony that I claim the foregoing as my own I hereunto ailix mysignature in presence of two witnesses.

JOHN F. O. RIDER.

Vitnesscs:

DAVID WnrsroN, W. J. QUINN.

